Kenny has "I'm going to die in the final act" written all over him if you ask me.
As for if it comes down to a choice between Kenny or Ben, I would side with Ben without hesitation. So far, Kenny has run away and left Shawn to die, needlessly murdered Lilly's father, hid in a stall while Lee and Lilly fought Danny St. John, and left Lee under a door to be mauled by a pack of walkers. Yeah, I feel bad about his family. But bottom line is he's a coward who can't be trusted. Ben screwed up with the bandits, sure. But even then, he did what he did because he was genuinely trying to help. IMO, Ben is still way more trustworthy than Kenny.